Search Publications
A Conditional Luminosity Function Model of the Cosmic Far-infrared Background Anisotropy Power Spectrum
Cooray, Asantha; De Bernardis, Francesco
The cosmic far-infrared background (CFIRB) is expected to be generated by faint, dusty star-forming galaxies during the peak epoch of galaxy formation. The anisotropy power spectrum of the CFIRB captures the spatial distribution of these galaxies in dark matter halos and the spatial distribution of dark matter halos in the large-scale structure. E…
Turbulent Characteristics in the Intensity Fluctuations of a Solar Quiescent Prominence Observed by the Hinode Solar Optical Telescope
Foullon, C.; Chapman, S. C.; Leonardis, E.
We focus on Hinode Solar Optical Telescope (SOT) calcium II H-line observations of a solar quiescent prominence (QP) that exhibits highly variable dynamics suggestive of turbulence. These images capture a sufficient range of scales spatially (~0.1-100 arcsec) and temporally (~16.8 s-4.5 hr) to allow the application of statistical methods used to q…
Discovery of "Warm Dust" Galaxies in Clusters at z ~ 0.3: Evidence for Stripping of Cool Dust in the Dense Environment?
Smail, I.; Altieri, B.; Valtchanov, I. +15 more
Using far-infrared imaging from the "Herschel Lensing Survey," we derive dust properties of spectroscopically confirmed cluster member galaxies within two massive systems at z ~ 0.3: the merging Bullet Cluster and the more relaxed MS2137.3-2353. Most star-forming cluster sources (~90%) have characteristic dust temperatures similar to local field g…
Helioseismology of a Realistic Magnetoconvective Sunspot Simulation
Birch, A. C.; Braun, D. C.; Rempel, M. +1 more
We compare helioseismic travel-time shifts measured from a realistic magnetoconvective sunspot simulation using both helioseismic holography and time-distance helioseismology, and measured from real sunspots observed with the Helioseismic and Magnetic Imager instrument on board the Solar Dynamics Observatory and the Michelson Doppler Imager instru…
Evolution of the Symbiotic Nova PU Vul—Outbursting White Dwarf, Nebulae, and Pulsating Red Giant Companion
Kato, Mariko; Hachisu, Izumi; Mikołajewska, Joanna
We present a composite light-curve model of the symbiotic nova PU Vul (Nova Vulpeculae 1979) that shows a long-lasting flat optical peak followed by a slow decline. Our model light curve consists of three components of emission, i.e., an outbursting white dwarf (WD), its M-giant companion, and the nebulae. The WD component dominates in the flat pe…
The Chandra HRC View of the Subarcsecond Structures in the Nuclear Region of NGC 1068
Elvis, Martin; Risaliti, Guido; Karovska, Margarita +2 more
We have obtained a high spatial resolution X-ray image of the nucleus of NGC 1068 using the High Resolution Camera (HRC-I) on board the Chandra X-ray Observatory, which provides an unprecedented view of the innermost 1 arcsec radius region of this galaxy. The HRC image resolves the narrow-line region into X-ray emission clumps matching bright emis…
Characteristic Size of Flare Kernels in the Visible and Near-infrared Continua
Xu, Yan; Cao, Wenda; Jing, Ju +1 more
In this Letter, we present a new approach to estimate the formation height of visible and near-infrared emission of an X10 flare. The sizes of flare emission cores in three wavelengths are accurately measured during the peak of the flare. The source size is the largest in the G band at 4308 Å and shrinks toward longer wavelengths, namely the green…
Properties of Umbral Dots from Stray Light Corrected Hinode Filtergrams
Ichimoto, Kiyoshi; Ravindra, B.; Mathew, Shibu K. +3 more
High-resolution blue continuum filtergrams from Hinode are employed to study the umbral fine structure of a regular unipolar sunspot. The removal of scattered light from the images increases the rms contrast by a factor of 1.45 on average. Improvement in image contrast renders identification of short filamentary structures resembling penumbrae tha…
A Suzaku Observation of Mkn 590 Reveals a Vanishing Soft Excess
Rivers, Elizabeth; Markowitz, Alex; Rothschild, Richard +1 more
We have analyzed a long-look Suzaku observation of the Seyfert 1.2 Mkn 590. We aimed to measure the Compton reflection strength, Fe K complex properties, and soft excess emission as had been observed previously in this source. The Compton reflection strength was measured to be in the range 0.2-1.0 depending on the model used. A moderately strong F…
Active Region Moss: Doppler Shifts from Hinode/Extreme-ultraviolet Imaging Spectrometer Observations
Tripathi, Durgesh; Mason, Helen E.; Klimchuk, James A.
Studying the Doppler shifts and the temperature dependence of Doppler shifts in moss regions can help us understand the heating processes in the core of the active regions. In this paper, we have used an active region observation recorded by the Extreme-ultraviolet Imaging Spectrometer (EIS) on board Hinode on 2007 December 12 to measure the Doppl…